kepler.gl
Version:
kepler.gl is a webgl based application to visualize large scale location data in the browser
43 lines (41 loc) • 6.05 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.pansharpenBrovey = void 0;
// SPDX-License-Identifier: MIT
// Copyright contributors to the kepler.gl project
// Brovey Method: Each resampled, multispectral pixel is
// multiplied by the ratio of the corresponding
// panchromatic pixel intensity to the sum of all the
// multispectral intensities.
// Original code from https://github.com/mapbox/rio-pansharpen
//
var fs1 = "uniform sampler2D bitmapTexturePan;\nuniform float panWeight;\n\nfloat pansharpen_brovey_ratio(vec4 rgb, float pan, float weight) {\n return pan / ((rgb.r + rgb.g + rgb.b * weight) / (2. + weight));\n}\n\nvec4 pansharpen_brovey_calc(vec4 rgb, float pan, float weight) {\n float ratio = pansharpen_brovey_ratio(rgb, pan, weight);\n return ratio * rgb;\n}\n";
var fs2 = "precision mediump usampler2D;\n\n#ifdef SAMPLER_TYPE\n uniform SAMPLER_TYPE bitmapTexturePan;\n#else\n uniform sampler2D bitmapTexturePan;\n#endif\n\nuniform float panWeight;\n\nfloat pansharpen_brovey_ratio(vec4 rgb, float pan, float weight) {\n return pan / ((rgb.r + rgb.g + rgb.b * weight) / (2. + weight));\n}\n\nvec4 pansharpen_brovey_calc(vec4 rgb, float pan, float weight) {\n float ratio = pansharpen_brovey_ratio(rgb, pan, weight);\n return ratio * rgb;\n}\n";
function getUniforms() {
var opts = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
var imagePan = opts.imagePan,
_opts$panWeight = opts.panWeight,
panWeight = _opts$panWeight === void 0 ? 0.2 : _opts$panWeight;
if (!imagePan) {
return null;
}
return {
bitmapTexturePan: imagePan,
panWeight: panWeight
};
}
var pansharpenBrovey = exports.pansharpenBrovey = {
name: 'pansharpen_brovey',
fs1: fs1,
fs2: fs2,
defines: {
SAMPLER_TYPE: 'sampler2D'
},
getUniforms: getUniforms,
inject: {
'fs:DECKGL_MUTATE_COLOR': "\n float pan_band = float(texture2D(bitmapTexturePan, coord).r);\n image = pansharpen_brovey_calc(image, pan_band, panWeight);\n "
}
};
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